free variables.
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module RnPat (-- main entry points
rnPatsAndThen_LocalRightwards, rnBindPat,
-- ENH: thin imports to only what is necessary for patterns
-import {-# SOURCE #-} RnExpr( rnLExpr, rnStmts)
+import {-# SOURCE #-} RnExpr ( rnLExpr )
#ifdef GHCI
-import {-# SOURCE #-} TcSplice( runQuasiQuotePat )
+import {-# SOURCE #-} TcSplice ( runQuasiQuotePat )
#endif /* GHCI */
#include "HsVersions.h"
import HsSyn
import TcRnMonad
+import TcHsSyn ( hsOverLitName )
import RnEnv
-import HscTypes ( availNames )
-import RnNames ( getLocalDeclBinders, extendRdrEnvRn )
-import RnTypes ( rnHsTypeFVs,
- mkOpFormRn, mkOpAppRn, mkNegAppRn, checkSectionPrec, mkConOpPatRn
- )
+import RnTypes
import DynFlags ( DynFlag(..) )
-import BasicTypes ( FixityDirection(..) )
-import SrcLoc ( SrcSpan )
-import PrelNames ( thFAKE, hasKey, assertIdKey, assertErrorName,
- loopAName, choiceAName, appAName, arrAName, composeAName, firstAName,
- negateName, thenMName, bindMName, failMName,
- eqClassName, integralClassName, geName, eqName,
- negateName, minusName, lengthPName, indexPName,
- plusIntegerName, fromIntegerName, timesIntegerName,
- ratioDataConName, fromRationalName, fromStringName, mkUnboundName )
+import PrelNames
import Constants ( mAX_TUPLE_SIZE )
-import Name ( Name, nameOccName, nameModule_maybe, getOccName, nameSrcSpan )
-import OccName ( occEnvElts )
+import Name
import NameSet
-import LazyUniqFM
-import RdrName ( RdrName, GlobalRdrElt(..), Provenance(..),
- extendLocalRdrEnv, lookupLocalRdrEnv, hideSomeUnquals,
- mkRdrUnqual, nameRdrName, gre_name, globalRdrEnvElts, isLocalGRE )
-import LoadIface ( loadInterfaceForName )
-import UniqSet ( emptyUniqSet )
-import List ( nub )
-import Util ( isSingleton )
+import RdrName
import ListSetOps ( removeDups, minusList )
-import Maybes ( expectJust )
import Outputable
-import SrcLoc ( Located(..), unLoc, getLoc, cmpLocated, noLoc )
+import SrcLoc
import FastString
-import Literal ( inIntRange, inCharRange )
-import List ( unzip4 )
-import Bag (foldrBag)
-
-import ErrUtils (Message)
+import Literal ( inCharRange )
\end{code}
-*********************************************************
-* *
+%*********************************************************
+%* *
\subsection{Patterns}
-* *
-*********************************************************
+%* *
+%*********************************************************
\begin{code}
-- externally abstract type of name makers,
matchNameMaker
= NM (\ rdr_name thing_inside ->
do { names@[name] <- newLocalsRn [rdr_name]
- ; bindLocalNamesFV names $
- warnUnusedMatches names $
- thing_inside name })
+ ; bindLocalNamesFV names $ do
+ { (res, fvs) <- thing_inside name
+ ; warnUnusedMatches names fvs
+ ; return (res, fvs) }})
topRecNameMaker, localRecNameMaker
- :: UniqFM (Located Fixity) -- mini fixity env for the names we're about to bind
- -- these fixities need to be brought into scope with the names
- -> NameMaker
+ :: MiniFixityEnv -> NameMaker
-- topNameMaker and localBindMaker do not check for unused binding
localRecNameMaker fix_env
[(nameSrcSpan name, nameOccName name) | name <- names]
; thing_inside pats' } }
where
- doc_pat = ptext SLIT("In") <+> pprMatchContext ctxt
+ doc_pat = ptext (sLit "In") <+> pprMatchContext ctxt
-- entry point 2:
-- (e.g. in the pattern (x, x -> y) x needs to be bound in the rhs of the tuple)
SigPatIn pat ty -> do
- patsigs <- doptM Opt_PatternSignatures
+ patsigs <- doptM Opt_ScopedTypeVariables
if patsigs
then rnLPatAndThen var pat
(\ pat' -> do { (ty', fvs1) <- rnHsTypeFVs tvdoc ty
LitPat lit -> do { rnLit lit; lcont (LitPat lit) }
- NPat lit mb_neg eq ->
+ NPat lit mb_neg _eq ->
do { (lit', fvs1) <- rnOverLit lit
; (mb_neg', fvs2) <- case mb_neg of
Nothing -> return (Nothing, emptyFVs)
; return (res, fvs_res `plusFV` fv_expr) }
#ifndef GHCI
- pat@(QuasiQuotePat _) -> pprPanic "Can't do QuasiQuotePat without GHCi" (ppr p)
+ (QuasiQuotePat _) -> pprPanic "Can't do QuasiQuotePat without GHCi" (ppr p)
#else
QuasiQuotePat qq -> do
(qq', _) <- rnQuasiQuote qq
; rnLPatsAndThen var pats $ \ patslist ->
lcont (TuplePat patslist boxed placeHolderType) }
- TypePat name ->
- do { (name', fvs1) <- rnHsTypeFVs (text "In a type pattern") name
- ; (res, fvs2) <- lcont (TypePat name')
+ TypePat ty ->
+ do { (ty', fvs1) <- rnHsTypeFVs (text "In a type pattern") ty
+ ; (res, fvs2) <- lcont (TypePat ty')
; return (res, fvs1 `plusFV` fvs2) }
+ p -> pprPanic "rnLPatAndThen" (ppr p)
+
-- helper for renaming constructor patterns
rnConPatAndThen :: NameMaker
| Pattern (Located Name) (RdrName -> a)
| Update
+choiceToMessage :: RnHsRecFieldsChoice t -> String
choiceToMessage (Constructor _ _) = "construction"
choiceToMessage (Pattern _ _) = "pattern"
choiceToMessage Update = "update"
+doDotDot :: RnHsRecFieldsChoice t -> Maybe (Located Name, RdrName -> t)
doDotDot (Constructor a b) = Just (a,b)
doDotDot (Pattern a b) = Just (a,b)
doDotDot Update = Nothing
+getChoiceName :: RnHsRecFieldsChoice field -> Maybe (Located Name)
getChoiceName (Constructor n _) = Just n
getChoiceName (Pattern n _) = Just n
getChoiceName (Update) = Nothing
\ fields2 ->
cont (HsRecFields (fields1 ++ fields2) dd)
-needFlagDotDot str = vcat [ptext SLIT("Illegal `..' in record") <+> text str,
- ptext SLIT("Use -XRecordWildCards to permit this")]
+needFlagDotDot :: String -> SDoc
+needFlagDotDot str = vcat [ptext (sLit "Illegal `..' in record") <+> text str,
+ ptext (sLit "Use -XRecordWildCards to permit this")]
-badDotDot str = ptext SLIT("You cannot use `..' in record") <+> text str
+badDotDot :: String -> SDoc
+badDotDot str = ptext (sLit "You cannot use `..' in record") <+> text str
-badPun fld = vcat [ptext SLIT("Illegal use of punning for field") <+> quotes (ppr fld),
- ptext SLIT("Use -XRecordPuns to permit this")]
+badPun :: Located RdrName -> SDoc
+badPun fld = vcat [ptext (sLit "Illegal use of punning for field") <+> quotes (ppr fld),
+ ptext (sLit "Use -XNamedFieldPuns to permit this")]
-- wrappers
\begin{code}
rnLit :: HsLit -> RnM ()
rnLit (HsChar c) = checkErr (inCharRange c) (bogusCharError c)
-rnLit other = return ()
-
-rnOverLit (HsIntegral i _ _) = do
- (from_integer_name, fvs) <- lookupSyntaxName fromIntegerName
- if inIntRange i then
- return (HsIntegral i from_integer_name placeHolderType, fvs)
- else let
- extra_fvs = mkFVs [plusIntegerName, timesIntegerName]
- -- Big integer literals are built, using + and *,
- -- out of small integers (DsUtils.mkIntegerLit)
- -- [NB: plusInteger, timesInteger aren't rebindable...
- -- they are used to construct the argument to fromInteger,
- -- which is the rebindable one.]
- in
- return (HsIntegral i from_integer_name placeHolderType, fvs `plusFV` extra_fvs)
-
-rnOverLit (HsFractional i _ _) = do
- (from_rat_name, fvs) <- lookupSyntaxName fromRationalName
- let
- extra_fvs = mkFVs [ratioDataConName, plusIntegerName, timesIntegerName]
- -- We have to make sure that the Ratio type is imported with
- -- its constructor, because literals of type Ratio t are
- -- built with that constructor.
- -- The Rational type is needed too, but that will come in
- -- as part of the type for fromRational.
- -- The plus/times integer operations may be needed to construct the numerator
- -- and denominator (see DsUtils.mkIntegerLit)
- return (HsFractional i from_rat_name placeHolderType, fvs `plusFV` extra_fvs)
-
-rnOverLit (HsIsString s _ _) = do
- (from_string_name, fvs) <- lookupSyntaxName fromStringName
- return (HsIsString s from_string_name placeHolderType, fvs)
+rnLit _ = return ()
+
+rnOverLit :: HsOverLit t -> RnM (HsOverLit Name, FreeVars)
+rnOverLit lit@(OverLit {ol_val=val})
+ = do { let std_name = hsOverLitName val
+ ; (from_thing_name, fvs) <- lookupSyntaxName std_name
+ ; let rebindable = case from_thing_name of
+ HsVar v -> v /= std_name
+ _ -> panic "rnOverLit"
+ ; return (lit { ol_witness = from_thing_name
+ , ol_rebindable = rebindable }, fvs) }
\end{code}
+----------------------------------------------------------------
+-- Old code returned extra free vars need in desugarer
+-- but that is no longer necessary, I believe
+-- if inIntRange i then
+-- return (HsIntegral i from_integer_name placeHolderType, fvs)
+-- else let
+-- extra_fvs = mkFVs [plusIntegerName, timesIntegerName]
+-- Big integer literals are built, using + and *,
+-- out of small integers (DsUtils.mkIntegerLit)
+-- [NB: plusInteger, timesInteger aren't rebindable...
+-- they are used to construct the argument to fromInteger,
+-- which is the rebindable one.]
+
+-- (HsFractional i _ _) = do
+-- extra_fvs = mkFVs [ratioDataConName, plusIntegerName, timesIntegerName]
+-- We have to make sure that the Ratio type is imported with
+-- its constructor, because literals of type Ratio t are
+-- built with that constructor.
+-- The Rational type is needed too, but that will come in
+-- as part of the type for fromRational.
+-- The plus/times integer operations may be needed to construct the numerator
+-- and denominator (see DsUtils.mkIntegerLit)
+
%************************************************************************
%* *
\subsubsection{Quasiquotation}
| tup_size <= mAX_TUPLE_SIZE
= return ()
| otherwise
- = addErr (sep [ptext SLIT("A") <+> int tup_size <> ptext SLIT("-tuple is too large for GHC"),
- nest 2 (parens (ptext SLIT("max size is") <+> int mAX_TUPLE_SIZE)),
- nest 2 (ptext SLIT("Workaround: use nested tuples or define a data type"))])
+ = addErr (sep [ptext (sLit "A") <+> int tup_size <> ptext (sLit "-tuple is too large for GHC"),
+ nest 2 (parens (ptext (sLit "max size is") <+> int mAX_TUPLE_SIZE)),
+ nest 2 (ptext (sLit "Workaround: use nested tuples or define a data type"))])
+patSigErr :: Outputable a => a -> SDoc
patSigErr ty
- = (ptext SLIT("Illegal signature in pattern:") <+> ppr ty)
- $$ nest 4 (ptext SLIT("Use -XPatternSignatures to permit it"))
+ = (ptext (sLit "Illegal signature in pattern:") <+> ppr ty)
+ $$ nest 4 (ptext (sLit "Use -XScopedTypeVariables to permit it"))
+dupFieldErr :: String -> RdrName -> SDoc
dupFieldErr str dup
- = hsep [ptext SLIT("duplicate field name"),
+ = hsep [ptext (sLit "duplicate field name"),
quotes (ppr dup),
- ptext SLIT("in record"), text str]
+ ptext (sLit "in record"), text str]
+bogusCharError :: Char -> SDoc
bogusCharError c
- = ptext SLIT("character literal out of range: '\\") <> char c <> char '\''
+ = ptext (sLit "character literal out of range: '\\") <> char c <> char '\''
-badViewPat pat = vcat [ptext SLIT("Illegal view pattern: ") <+> ppr pat,
- ptext SLIT("Use -XViewPatterns to enable view patterns")]
+badViewPat :: Pat RdrName -> SDoc
+badViewPat pat = vcat [ptext (sLit "Illegal view pattern: ") <+> ppr pat,
+ ptext (sLit "Use -XViewPatterns to enable view patterns")]
\end{code}
projects / ghc-hetmet.git / blobdiff